Like, the SlapChop is a good counter example I think. The commercial demos the item, makes it looks useful, uses hot sales tactics, a bunch of people think "it's just 20 bucks, and chopping stuff sucks", buy one, and now we've got a bunch of SlapChops in the landfill because in practice they're finicky and more annoying to use than just a knife.
To me, it seems like by volume commercials mostly fall into trying to convince you you want/need something that's ultimately not that useful vs inform, and the vast majority of actual useful things I've found via actively searching, or via word-of-mouth / seeing it at a friend's house.